Well-defined indium oxide (In2O3) nanocrystals were prepared in the solution phase by a new and reproducible peroxide-mediated route at relatively low temperatures (120−180 °C) using indium acetylacetonate as the precursor. The resulting 7-nm cubic-In2O3 nanocrystals were characterized using transmission electron microscopy (TEM), powder X-ray diffraction (XRD), selected area electron diffraction, and X-ray photoelectron spectroscopy (XPS). A combination of solution NMR spectroscopy, XPS, and FT-IR spectroscopy were used to confirm the presence of bound oleylamine and lauric acid on the nanocrystal surface. It was determined that the reaction does not produce crystalline In2O3 under these lower temperature reaction conditions in the absence of an organic peroxide; therefore, the peroxide plays a key role in oxide formation. The reaction occurs via a different pathway than the thermal pyrolysis or hydrolysis pathways that have been identified for the “heating-up” method. FT-IR spectroscopy and TEM were used to probe the reaction and growth kinetics, respectively, and it was determined that the peroxide quickly decomposes followed by a slower decomposition of the indium acetylacetonate. Upon In2O3 nucleation, nanocrystal growth occurs by a slow Ostwald ripening process, which differs from the relatively fast focusing growth mechanisms observed for the “heating-up” process that occurs at higher temperatures (>250 °C).

The di-tert-butylphosphido-boratabenzene ligand (DTBB) reacts with [(C2H4)2RhCl]2 yielding the dimeric species [(C2H4)Rh(DTBB)]2 (1). This species was fully characterized by multinuclear NMR and X-ray crystallography. Complex 1 readily dissociates ethylene in solution and upon exposure to 1 atm of H2 is capable of carrying out the hydrogenation of ethylene. The characterization of two Rh-H species by multinuclear NMR spectroscopy is provided. The reactivity of 1 towards the catalytic hydrogenation of alkenes and alkynes at room temperature and 1 atm of H2 is reported and compared to the activity of Wilkinson's catalyst under the same reaction conditions.

Species [(IMes)2Pt(H)(1‐Cl‐2‐SiMe3–BC5H4)] (1) was used as the source of the Cl‐boratabenzene anion for coordination to group VI transition metals, resulting in the formation of piano‐stool complexes [(η6‐1‐Cl‐2‐SiMe3–BC5H4)M(CO)3]– [M = Cr (2), Mo (4), W (5)] and a homodimetallic triple‐decker complex [(CO)3Cr(η6‐1‐Cl‐2‐SiMe3–BC5H4)Cr(CO)3]– (3). All species were spectroscopically characterized and the first X‐ray structure of a Cl‐boratabenzene species is reported.

No abstract

No abstract